Do not give her regular milk. Get to the store and buy KMR - its kitten milk in a can. Feed her with a bottle every TWO HOURS. Keep her warm. Bottle feeding is messy and time consuming, but oh-so-worth it.

You'll also have to help her potty after each feeding by gently rubbing a warm wet cloth on her bladder/belly. Her mom would have done this if she was around.

I have never had bottle babies as young as that, but I have had a few older ones. Good luck!